server/src/method/textDocument/hover.lua


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local parser = require 'parser'
local matcher = require 'matcher'

return function (lsp, params)
    local uri = params.textDocument.uri
    local results, lines = lsp:loadText(uri)
    if not results then
        return nil
    end
    -- lua是从1开始的，因此都要+1
    local position = lines:position(params.position.line + 1, params.position.character + 1, 'utf8')
    local text, kind = matcher.hover(results, position)
    if not text then
        return nil
    end

    local response = {
        contents = {
            value = text,
            kind  = kind,
        }
    }

    return response
end